Question

Which among the below assertions is not a relevant property of CE amplifier?

(a) High voltage gain

(b) High current gain

(c) High input resistance

(d) High output resistance

This question was posed to me in an interview for job.

I'd like to ask this question from Comparison of Transistor Amplifier topic in division Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

Correct answer is (d) High output resistance

To explain I would say: The voltage gain, current gain and input resistance CE amplifiers are utterly high but it has low output resistance.

The collector resistor (Rc) performs the purpose of controlling the collector current. Input and emitter resistors are adopted for biasing of transistor in an active region so that it becomes possible for the transistor to function as an amplifier.

Due to high current gain at the output of RC coupled CE amplifier, the resistance level at the output is exceedingly low.